Abstract
Co element was doped in Fe-6.5Si alloy and the corresponding soft magnetic composites were fabricated successfully by conventional powder metallurgy techniques in this work. Saturation magnetization of Co-doped Fe-6.5Si powder increases compared to powders without Co and the coercivity increases because of grain refinement. Co addition is helpful to improve the electrical resistivity of Fe-6.5Si alloy. After doping Co, it shows a significant trend towards a decrease for core loss of Fe-6.5Si SMCs by reducing both eddy current loss and hysteresis loss. The effective permeability of Co-doped Fe-6.5Si SMCs decreases monotony with the Co content changing from 0 to 7.0 wt%. Fe-6.5Si-1.0Co SMCs shows best magnetic performances (100 mT/50 KHz) with core loss of 781.03 mW/cm3 and effective permeability of 103.36.
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